considering that you only have 83 slayer it is going to be hard to say, because most of the decent cash tasks are not for a few levels still.
although after looking at the tasks lists there are only really two that i would consider high gp tasks (dark beasts and eddis) since kuradal can assign elves which is also a fairly high gp task if you are willing to pick up the drops or have a coin collector.
upgrading the slayer helmet would be a good idea. it shouldn't take particularly long.
Holy hell I need to get away from Kuradel. I feel like she knows I am 280k from never seeing her again. Warped Tort task after Warped Tort task. Dont want to waste point skipping, and I wont block them since at 85 I wont see them again.
At least she gives me Avainses pretty often, which is a nice away to stretch my legs and get no drops from Kree'ara
The tasks do get a hell of a lot better on average once you move up, even without preferred tasks. There is the odd bad on but they can usually be rushed if you're currently saving your points. The upgraded stats and adding teleports (for me the best part) is great for the helm, cant remember if you need to fuse rings to check how many kills left or not, had it upgraded for a loooong time.
Depending on how you like to play, might want to look at getting whatever tasks you can out of the way in the area, the item you get is best in slot to my knowledge, but since eoc i still have no idea how relevant it's stats are, though I'm sure plenty others get it.
Are you doing ports? After a while it can bring in a few mil a week, not the best money maker but alright for something on the side, also for eventually getting yourself some good defensive gear.
As for eventually going for max, certain dailies could help you along the way. Sinkholes I find great, quick dung xp and i'm a fan of the rings you can get there for their teleports. The other dailies i'm pretty much clueless on for how efficient they are for your time, again, I'm sure others can help you if you've any interest.
With weeklys, Tears of guthix would help a lot with your lower skills, hitting 80 craft will greatly increase the xp you get by making an ornate bowl, raising the cap to 300xp per tear. Help meg once a week at ports for a lamp, takes a few seconds. Not sure if circus is worthwhile and i've never found penguins worth it either, but i'm probably totally wrong.
Monthlies, Troll invasion is pretty good, as are god statues.